For 2011, the value of the Linux kernel, defined as redevelopment costs by paid developers, was estimated at 2.2 Billion Euros. It has gotten much larger since.

And much of the value is done by highly specialized experts. The type of people which write a draft of something like git in a few weekends.

And I do not know if you have ever worked at a large software project, but in order to work on it, you need to understand it somwhat, and in order to understand it, you have to do a noticeable fraction of the work of initial development.

To sum up: If you do not have hundreds of million Euros, or the equivalent in free time of extremely qualified volunteers, you do not have the resources to fork and maintain the kernel.

If you are serious with your suggestion, I'd start with a smaller kernel, which covers minimal requirements.

I am also not sure whether you are serious or trolling. Because some people use this difficult topic for trolling and sowing polarization. We see that in some discussions around Linux and AI/LLMs.